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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5508949241b0c36add7e9ed57a8f93c1df0158f20e013c73a5c87bb4a0b961e5' 
  AND token = '0cZUM+uInzDQO/CfT1F950rm5ARzBHExKEp58JjFuYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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