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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '954eee6c1b0b32de45c8256733405718d6839fa35b137b47fc4c2ab0587b2df8' 
  AND token = 'rP16JDJOPITsyEmU1EfHFjTua/47KTKY+Yue7hFca5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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