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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d9832f6cc6b280a23910b8112d628dee8b8f6d3a9af271704fbcf320dd0883' 
  AND token = 'JrYyzZbhp4mwtW4cJDEYiMCVNoJXrL4Jt67m75cdPa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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