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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53d40b23de413183bafa8b3076c57f30637f9fa9039306c1d59f7b66b66ea318' 
  AND token = 'TpU96O/ckXUa6HUIRSu4ThQ6mHn9fnjTc1V+sbuBDJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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