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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb74cbfa3c47c5e040ebed7cb8aaf4d22bb8fd992171493764984d7ba25bcec' 
  AND token = 's52FlVqCQwr0CA9M+qbCnX4u5mfFoKAg3ohMS83Gtv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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