SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ce20d409b26c5935156fbd8787eb1d751726af712732689bd79921e86b3982' 
  AND token = 'Y/XJhL2Ts/SlFoo+Uz1JmRpk1q5EAmvDUgqaZCkhHX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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