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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bbb027d713dff0b1e4cfd39c67c8ec0b3eb200c68dcff4b9c1c494ad82c046d' 
  AND token = 'SixkwRtX+T5mviQy15D+ZkD6PiVqaopM87K1lKZDEkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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