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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66da3e52ffe5a9d81e1e564d14d25a03f7ab83ffe38523172972a58f1c4c61b1' 
  AND token = 'GKkXFl449/lBSJyEaUz2SDIVC7RJE8w2hTNov2LKfyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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