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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7c9f914ae55d4de4720819a76ec69d05ce72dfb333f5b179d4dbc4ecd19e53' 
  AND token = '0oSdaGjOCS24dSyKkA6v9uZDXoVpfzW0lFfcSLcIfkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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