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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5436ebb20a125542a6a40698d2d90e2d75c58f2c45fdacd1c7e66ac30a39a31' 
  AND token = 'zGlWAhvBl8smNDUH1o27X3G2deWbYVE9x+5cc5CNIRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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