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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '691616328e431a4b318ec0fb82f7f925f0bcd7a330e0715a1d51564748de4edb' 
  AND token = 'ytjn9V3MEt9H/q2N0Ghd4eOC/Xlt/mgUuoTqkyoHT6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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