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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9124431f8d7ecf262ab541d1ad0bc2b087253b30d0971eee16324236dd669429' 
  AND token = 'M+86BdS/kXNQwEFjibwqjK/KtklVuTNz2aWaOKz+B3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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