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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd22ddad8bd8c95ad891103c2f159b8e6785dbd0030356aaf50ce334e2935dbce' 
  AND token = 'opTE/z/7FLYjjEtt1eKfWzY8up4ehqKYPSD4gqpVI3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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