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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29de369f05923deb8bd5626ce2dc73534ae8a2a69a8b0f920b4ff92b55bed4d' 
  AND token = 'xCcjXjPIt2sBa1J5B8mi7lRPu9Tf+kWNu/c69Ty7dJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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