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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a00d1546ae4f32603b15135be972682075164f14b75aa89f2f42862aea1860' 
  AND token = 'VvkuqfWOY7PNly2POPwD+uTKH2OKUYhj8uwpO1op3sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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