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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9660a9359c18748006fa35a175189c73ff58abd242c470f661d65cd3a0cbd9d' 
  AND token = 'ZA8FhNvab3PIPieF2n0PYSyi3Bde7xc6k13FKN+S9HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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