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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd60ed2300bf20584baea349329ca3eea2717e43378fd27c6fae8a3c08929de2' 
  AND token = 'j+dc+YqZX/UH+2JziJpX4MXwA3aO2o0TeubqT76ZVfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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