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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5451e26ffd05863044b9abda8c63f93c669b1a76539c58ddacb22f82f9d39443' 
  AND token = 'keCZfvCsBrtqy9oo6dbiLsy762n6uL4qfNrNmBnj21A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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