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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd694b7b8170aed7b80b92fd1c013e2376454c32423d6b6da7fb7d531e4873d98' 
  AND token = 'FktqmlEebButR9UAxItAF/s+h0NRx5eMb51f1ilfR7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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