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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f01fd6de4eeeb37662e6ce1ad06a5a962f693366c9638a8b0c1a9023bbe994a' 
  AND token = '2DlL1RCoe6FLu9YBbV34tDqPb4e9WB7xJ8S1MXy3WTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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