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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b753b63b2c5a1c91137f5f0a8975b57f164f91d38ce03f29da7d7c43601b4a' 
  AND token = 'Gc2WPu9739jp09HahWsbrhgZdRMq2VW4oLYWIs1Yzow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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