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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c393d15bc75a0e3009e69b375697a7568305a9b69b20924109d2bbfd3712b85' 
  AND token = 'I569efXM15RUej8DBAv9+mJX3tzNg7cOF+3C48TkLOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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