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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e402cbe888fb470136d47df44c1f48eb98176d43727f230015bae23a0dd23e9' 
  AND token = 'sxuefYUaCZT7cd5LQXwr73aeroHXb6cbfuQMqtHFveA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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