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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59274aae766c295ab303c134a335dc5ecab11bde61ccc633a505e100fcbd4419' 
  AND token = 'ntoEZTDacZg32QrsTk/Vxh2ocKskkMoWkQ9eiyhhL7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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