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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03892d6d79248c06e9253027c7fc00b4af97e02b2fe34e658d45a7f82d0200cf' 
  AND token = 'Yov+8vJGvSqEvovlCE3321kJYGyFlMMZ+nSONn0ianM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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