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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '856ca08843d741da18122e4e08091cb53ffb4d0fd7a4ed260ac82fdebc28b22b' 
  AND token = 'Kzw9u0zpok7zO3i1RidcYaws0jLVTRFZi5epXH1YFi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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