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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0515ef375c7a440a4ab2da7b6128f7b7dab2f0a77c654ff3d7fc4da03460480' 
  AND token = 'EurQS2DvohrNFvmqYKqB496bl6O3UOOUDoIwWMhg34E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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