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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '135b099cac8e8f97b715b55f87d615d50392cb01d2616dc2dfe97b0e6d64e9d0' 
  AND token = '6NE4KeDv5yDpl8+/XON9kZnzvm2ASY51ANU6xvx05i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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