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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7407c711644d53f4ea9bdcc820774bf3c423377530d0a71a75e726f4902ebab1' 
  AND token = '9kHB93TD/9Go0bVr47d45uHIgJ5uCO8aszDy8H9V9g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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