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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a374b4ad6d7f1d64a1ec422a013e9f8484d678706bdd43930d528ac0adb7948' 
  AND token = 'TRFGUXUG8KLGEqUzlPLEV0QEECt0TvX4jTxTBxa2+Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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