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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52587425e922288694c28c19c5a9cce6e6ac93267d8730b8f42569ab68dce5f9' 
  AND token = 'xIlIenIbonpXG4V28iCT4C47ATOqS3wxKYKTX2COomQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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