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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5951ab37450002636de7bd6c1fa415ab4a78e01091ddce965996011d6a61ad2' 
  AND token = 'J6EzME3s784JO0jywtnirADca45O1PkZRgsPsl4se/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00273

JSON explain

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