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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c4ac6b687f26207704014492780aa476da87460d36b0ea0ed00024e93460199' 
  AND token = 'TVLlYv73QrYVJ9A+dJmQ+7MshH4NHtAalUHalgbzvi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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