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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95cce048fb3d962c087f0278f6815433003c432ce3817ff9099a148a35148d88' 
  AND token = 'CP4y20PXhZ/rKc0/5amCwgxWmzc4cYfrqzkTX3uI8tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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