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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f07b6d802d37a54c715a16110cfe2fa85516c2eade35c7c09cd7835d7ad7c1' 
  AND token = 'ddHx+sZaNf78cmaLd7o2mvAnhR3576O4RiXofPdns9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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