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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39974fcffc2ced2681f95d998424af69f7188be238768a3e21b2bedeebb6a578' 
  AND token = '2gHwBEzQm5VI4hNXVAJpZAy5EzM3Ei78Ta1SdkGgnOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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