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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b47e3c6777b5719f3ae1bdb7b47bf1dd8913ca5ee4ad36da64e244a2d3d23ee' 
  AND token = '/TAEY98iJA7YQlORu1+ciqOS28sG1EHqvbDIk0sJM8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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