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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5daf7c9a1fa4f6a38a4df90bd348b2f853ad82d90f45d7383388708c807671d' 
  AND token = 'K/8btdVk7N06P61QwOUoTg1jDYsXA4Mv0NoeH9P0zLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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