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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b53c0684e493cdb25197f537da1f5a5b278ebb6b0db17b8174ab125923c40cd' 
  AND token = 'FLFDr3+ZrlwGqYajqftidybkIPDEq9/4aOG5CPFuO6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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