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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7144ffdd9389f50ecf6eb3d656a26fa988646f13d7986bbbc902c8c0740fd9d9' 
  AND token = '8MdnJCTfH+fYt9rcofE4fDGDQBGRxLRB/WI0KFm5KQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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