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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8252ffe2faad0f953433cc0ab2ff103954bb29f25cb9df87864674152ecedab' 
  AND token = 'dYsJ1l3iMIk6QlbTyW+nSgUBS7GSCcT93c08u5xoqgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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