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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c518d856a2cdd391e7fb278962c2fe1227db633dc2430d1729b3170f3cc588' 
  AND token = 's5zgiE0BLeSQPif0hyH5cwfM6QUAx6YW1rX0c/hb+So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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