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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552026ba6aa9ca1bfa714cf8019919ccb8e5339744aa3ab9c44a9e446820a797' 
  AND token = 'djesR004CKG+Q1hUtQ3pSOss4ukq5LrH/hHgJ1Uah2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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