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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd60b873d198c4d7c85e084dd6225feeae1b78889c0dfdd7c985aaa03803d6d3' 
  AND token = 'IRyKXQx2jsrsCiYkxLyC/ezE4lEtjFKMbs6rkwQkqVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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