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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3755fb32b5a7dfa2aef27027b83952077fa85cba7ec6520d748c2cfc2ea51a26' 
  AND token = 'CsWoo0/0JcK78kUcjnQovEt5FFwFtZb/nY1k8UUf0d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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