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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '152e588be6430b0bdc9793b9084ef85e59451d1e4751eed43728ef2e113bbc30' 
  AND token = 'noTOr0ddqsxkMbuj0mD6HDE4yW+EU8MN+giWlv57T28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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