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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f33e6b2d83a278c6216d1a35627540c50f853a9093fb173c4f400c7e2ddff9b' 
  AND token = 'kJaEl+OtbogHlGtNVfIowbIeIK+aoBG917E7/nvHT0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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