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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eaa433b05880a4ee70095d915edcfd01dd49f5303f2b5042b6ff897826a8791' 
  AND token = '9mIRwf1KhRUgrWYeG1zyziMcBBgCC0GrzKmwPALoytQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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