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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f6410f693ecee22d6a5dafad779b35f08b3b3a20bdd6a44e623e52009ab7d88' 
  AND token = 'i96aEhBHj1E7Dyefbe98y4cZ2KQCf6aS4X7iYpvt+D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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