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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0af9286dbe0c02164cc712761b49d8c28c5acd881387efb41ee82fd9fee61c8a' 
  AND token = 'TbAWkgGRmC4qAX+JniKbCc/4r/1g8KZqUeHg8uU5OgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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