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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055fd37d8ae5260760cd8a46c84cbb99dd931d532456552a5bd4da4897bff330' 
  AND token = 'JkAqKpCoaWZGDQtWriiy6sTN6HDecjHD5LAVtDW8DvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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