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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '340a2d87f721e5c37ebcbd3eb2b06530e612d323d91081750397ce5206c3170c' 
  AND token = 'NX10XMgUuLPmhcSVLYDIM/u0KtjD9j9Mt9ov2/TV9W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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