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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13992ffcc6691b93e15749a6d976daccad8426218cf9c6f9c6ca64a03640df28' 
  AND token = 'CnC0vUM8TZx1v8OAQ11qy00Lged34ml2PdivAYecqq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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