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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e48938e0395795c3a1303b320a041d7ad7e3970d70720b97d5f159ec1d0ae4db' 
  AND token = '445KBS1BLPmNq+cGdfN3GL/oN8Sj1Ku8d9Wu2y2UftY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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