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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9f2359d072e8c4c7ecaca9eadc2e8adde89f719f6da0cce626fd61a87e3b93' 
  AND token = 'UlNROt0el3ecxV6oBX7Qkeq1W+VjUkXhaMvYob+ACRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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