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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59082ec52f80949292029b6c0d30c50f17ce15070ca200a9c72a47cadb4e1235' 
  AND token = 'tzWXfrFZLNOHumIpld4ypRLzmaS6GvlkDvS3r7MQQMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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