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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1f9888710a52195cd86d1d81cc88fad7dc5eede7ed277a39f94e5098d4e490b' 
  AND token = 'x5GBPHhG/ucfx+3ITpg21bZIeETElWvL3FaIlFBLHh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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