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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5244cbe2a6ce382e09372556bd433ec2a9c4c79ca04ff3ef2e783c8d31945943' 
  AND token = '85AfgIsZns0R2HXuFl57APP7v2CSt9zVcW1u8Ec7TUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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