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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eff14329323384418088f4d1ade37845e010b48f4da6911043175b45202d4257' 
  AND token = 'GhXKEfuvTiU6yK0d2iZ0Txa7NYH2dSS6CNledciibV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}