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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e87ba6ca93f67a920c393b0e7d95a4adcf46cd44c09f863fd29638b8bd0c20' 
  AND token = 'qEqc7/9mtE/m0MJ7hHuY6cFdtKGugXjYaC+7sBDsc1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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