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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81233f8c39cb42a2ae3a722ba9d37a7be497de146b0c77549b2bd1519a84ebaa' 
  AND token = '/0zZ6aXOh2no2O3BG2nv6RJCsQCab7M213gob3e7564=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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