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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc2fea4dda7edca248f5d39e8a1b7fa5895c184a4a20451061f4afaa1068ff3' 
  AND token = 'gK+kAJN+AFzayQ066rg9LMxVDpgiS800fWZhgre7+94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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