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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f63386de23acf8f7a1e1eb10b6319c0dd7aa8dd537bfd14e977b538ef1a377' 
  AND token = '1asUe1pLVfo/12Kkg8Fy+ziAF+zRi4Q51lVbyHnQJzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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